Is this wallet online or downloadable onto your computer?
It's a desktop wallet, so you download it, and sync it... This process can take hours to days and takes +100 Gb of diskspace. If you don't want this, you should look at an SPV wallet like electrum.
BTW: i would strongly advice to stay away from online wallets for multiple reasons.
Why does it take so much space? Does it have to download a copy of the blockchain on your HDD?